Signaling by electromagnetic waves.



R. A. EESSENDEN. SIGNALING BY ELECTROMAGNETIC WAVES. APPLICATION FILED DEO.17, 1906.

998,567, Patented July 18,1911.

' 2 SHEETS-SHEET 11 R. A. PESSENDEN.

SIGNALING BY ELECTROMAGNETIC WAVES.

APPLICATION FILED DE(.17,1906.

998,567, Patented July 18,1911.

2 SHEETSSHEBT 2.

a 1i I mmmmmvfliml :WMWAWQQX 7 crete and iron bars.

UNITED STATES PATENT OFFICE.

REGINALD A. FESSENDEN, orv WASHINGTON, DISTRICT OIFICOLUMBIA, ASSIGNOR ro- NATIONAL ELECTRIC SIGNALING COMPANY, OF PITTSBURG, PENNSYLVANIA, A

CORPORATION OF NEW JERSEY.

SIGNALING BY ELECTROMAGNETIC WAVES:

Specification of Letters Patent.

Patented July 1s, 1911.

Application filed December 17, 1906. I 1 Serial No. 348,195.

To all whom it"may concern:

Be it known that I, REGINALD A. Fuses, DEN, a citizen of the United States, and resident of Washington, in the District of Columbia, have invented certain new and useful Improvements in Signaling by Electromagnetic Waves, of which the following is a specification.

My invention relates to antennae for wireless stations.

In the accompanying drawings forming a part of thisspecificationFigures 1 and 2 show arrangements embodying the inven waves which manifestly decreases its efiiciency. In the arrangements'here proposed the supports are formed of a combination of conducting and insulating. material of a character which would blockoff the receipt of the waves if used-in the usual manner,

butare here so'arranged and placed as not to interfere with the receipt or emission of the waves. y

In Fig. 1, 1 is a tower constructed of con- The antennae 2 are supported onit and the posts 4,? 5, 6-, 7, 8, 9. 10 is the station facing in the direction from which it is desired to receive the electromagnetic waves.

In Fig. 2, 11, 12, 13, 14 are term-concrete structures supporting the antennae 15, and 16 is the station placed in the direction to or from which it is desired to send or receive the electromagnetic waves. By thus placing the station in, front of the ferro-concrete sup orts and alined in the direction-of the statlon'to. which it is desired to communicate, 'I have ascertained that the uselessabsorption of the waves is greatly reduced. What I claim is:, I

1. In apparatus for electromagnetic wave telegraphy, the combination with an operating instrument at the station, of'an an tenna connected thereto having a horizontal portion extending backwardly in the line of ropagation of the message and supported y a metallic structure at its rear end, where bythe antenna protects the support-from useless absorption of the waves.

2. Inapparatus for electromagnetic wave telegraphy, the combination with the working instruments, of an antenna connected thereto and extending backwardly in the line direct away fromthe line of propagationand a ferro-concrete structure supporting the rear end of the antenna, whereby the active part of the antenna .lies between ing communicated with.

-3. An antenna for wireless telegraphy,

oblique position with respect to the horizon tal and havinga horizontal component extending in the direction of propagation, said antenna being connected at the forward end to the telegraph instruments and being supported at the-rear end by a ferro-concrete tower, which latter is thereby protected from useless absorption of'the waves.

Signed at Brant Rock, in the county of Plymouth and State of Massachusetts this 15th day of December A. D. 1906.

" REGINALD A. FESSENDEN.

Witnesses: v I

ADELINE WOLENER, Jnssm E. BENT.

the supporting structure and the station be- .com risin a series of wires 1 in in an 

